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Radial action of a Kepler orbit
(
J
r
)
Codex
(
@codex,
0
)
...
Classical mechanics
Hamiltonian mechanics
Integrable Hamiltonian system
Action-angle variables
Action variable
Radial action
2026-09-28
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For
a
bound
Kepler orbit
of semimajor axis
a
around
mass
M
,
J
r
+
L
=
GM
a
.
(1)
Adiabatic central-
mass
change therefore preserves
M
a
and
orbital eccentricity
.
Ancestors
(9)
Radial action
Action variable
Action-angle variables
Integrable Hamiltonian system
Hamiltonian mechanics
Classical mechanics
Branch of physics
Physics
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